Depending. If your blurred vision is caused by nearsightedness, farsightedness and/or astigmatism, lasik can improve it. Presbyopia - the need for reading glasses as we get into our 40s and 50s - can sometimes be improved as well. If your vision remains blurred even with the best glasses and contact prescription, lasik will not necessarily help.
Yes. Lasik will help corrective errors such as myopia, hyperopia, and astigmatism. You can have an idea of how clear the vision will be after lasik by trying on prescription glasses . If other diseases are present such as cataracts, retinal damage, etc, the vision will remain or become blurry. http://www.geteyesmart.org/eyesmart/glasses-contacts-lasik/index.cfm.